﻿#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Net;
using System.Runtime.CompilerServices;
using Newtonsoft.Json.Utilities;

namespace Newtonsoft.Json.Serialization
{
  internal abstract class JsonSerializerInternalBase
  {
    private class ReferenceEqualsEqualityComparer : IEqualityComparer<object>
    {
      bool IEqualityComparer<object>.Equals(object x, object y)
      {
        return ReferenceEquals(x, y);
      }

      int IEqualityComparer<object>.GetHashCode(object obj)
      {
#if !(NETFX_CORE)
        // put objects in a bucket based on their reference
        return RuntimeHelpers.GetHashCode(obj);
#else
        // put all objects in the same bucket so ReferenceEquals is called on all
        return -1;
#endif
      }
    }

    private ErrorContext _currentErrorContext;
    private BidirectionalDictionary<string, object> _mappings;
    private bool _serializing;

    internal readonly JsonSerializer Serializer;
    internal readonly ITraceWriter TraceWriter;

    protected JsonSerializerInternalBase(JsonSerializer serializer)
    {
      ValidationUtils.ArgumentNotNull(serializer, "serializer");

      Serializer = serializer;
      TraceWriter = serializer.TraceWriter;

      // kind of a hack but meh. might clean this up later
      _serializing = (GetType() == typeof (JsonSerializerInternalWriter));
    }

    internal BidirectionalDictionary<string, object> DefaultReferenceMappings
    {
      get
      {
        // override equality comparer for object key dictionary
        // object will be modified as it deserializes and might have mutable hashcode
        if (_mappings == null)
          _mappings = new BidirectionalDictionary<string, object>(
            EqualityComparer<string>.Default,
            new ReferenceEqualsEqualityComparer(),
            "A different value already has the Id '{0}'.",
            "A different Id has already been assigned for value '{0}'.");

        return _mappings;
      }
    }

    private ErrorContext GetErrorContext(object currentObject, object member, string path, Exception error)
    {
      if (_currentErrorContext == null)
        _currentErrorContext = new ErrorContext(currentObject, member, path, error);

      if (_currentErrorContext.Error != error)
        throw new InvalidOperationException("Current error context error is different to requested error.");

      return _currentErrorContext;
    }

    protected void ClearErrorContext()
    {
      if (_currentErrorContext == null)
        throw new InvalidOperationException("Could not clear error context. Error context is already null.");

      _currentErrorContext = null;
    }

    protected bool IsErrorHandled(object currentObject, JsonContract contract, object keyValue, IJsonLineInfo lineInfo, string path, Exception ex)
    {
      ErrorContext errorContext = GetErrorContext(currentObject, keyValue, path, ex);

      if (TraceWriter != null && TraceWriter.LevelFilter >= TraceLevel.Error && !errorContext.Traced)
      {
        // only write error once
        errorContext.Traced = true;

        string message = (_serializing) ? "Error serializing" : "Error deserializing";
        if (contract != null)
          message += " " + contract.UnderlyingType;
        message += ". " + ex.Message;

        // add line information to non-json.net exception message
        if (!(ex is JsonException))
          message = JsonPosition.FormatMessage(lineInfo, path, message);

        TraceWriter.Trace(TraceLevel.Error, message, ex);
      }

      // attribute method is non-static so don't invoke if no object
      if (contract != null && currentObject != null)
        contract.InvokeOnError(currentObject, Serializer.Context, errorContext);

      if (!errorContext.Handled)
        Serializer.OnError(new ErrorEventArgs(currentObject, errorContext));

      return errorContext.Handled;
    }
  }
}